Pre-Sign Contract Interaction Summary

WHAT IT DOES

Pre-Sign Contract Interaction Summary connects to your EVM wallet, reads pending transaction data (contract address, value, data payload), and decodes the contract interaction into plain language before you sign. It identifies known function signatures including transfer, approve, transferFrom, and others, extracts arguments from the calldata, and fetches contract source code summary information. The tool provides a risk assessment based on the function being called and generates an AI-powered explanation of what the interaction will do, what permissions it requests, and what risks to consider.

HOW TO USE

Navigate to any page where you are about to sign a contract interaction. Open the Pre-Sign Contract Interaction Summary, connect your EVM wallet, and either paste a transaction hash or manually enter the contract address, function signature, and arguments. Click "Look up transaction" to fetch on-chain data and generate an explanation. The tool will decode the function call, display the contract address, function name, arguments, value, risk level, and contract source summary. Review the AI explanation alongside the raw transaction details, then verify the same details in your wallet's signature prompt before approving.

TECHNICAL SECTION — CONTRACT INTERACTION DECODING WITH SIGNATURE LOOKUP

The tool fetches transaction data from the blockchain using the connected wallet's provider. It extracts the contract address, value, and data payload from the transaction. The data payload's first 4 bytes (10 hex characters) are used as the function signature. The tool maintains a built-in lookup table of common function signatures including transfer (0xa9059cbb), approve (0x095ea7b3), and transferFrom (0x23b872dd). For recognized signatures, the tool decodes arguments from the calldata by parsing the remaining bytes into 32-byte chunks. The tool also fetches a summary of the contract source code to provide context about the contract being interacted with. A risk level is assigned based on the function name: approve and transferFrom are flagged as high risk, transfer and deposit as medium risk, and view functions as low risk. The AI layer receives the decoded data and generates a plain-language explanation. This approach works without requiring external API keys or proprietary databases.

WHAT IT CANNOT SEE

This tool cannot read the actual intent behind a contract interaction. It cannot determine if the contract address is a known scam without an external database. It cannot detect contracts that mimic legitimate contracts. It cannot decode function calls that use custom or non-standard ABIs. It cannot predict the outcome of the contract interaction. It cannot determine if the contract has been audited or is safe to interact with. The user must still verify the transaction details in their wallet before signing. The AI explanation is generated from on-chain data and does not constitute financial advice or a security audit.

PLEASE NOTE

EVM chains only. Explanations are AI-generated from data the app reads on-chain—always review what you are actually signing in your wallet before approving it. The wallet's own signature prompt remains the final and only protection against unwanted transactions. This tool is read-only; it never sends transactions or signs anything on your behalf.